print("() {} [] <>")
S = input()
s1 = ''


for char in s:
    if char == '(':
        s1 += char
        
    if char == ')':
        if len (s1)>0:
            if s1[len (s1)-1] == '(':
                s1 = s1 [:-1]
                
    if char == '[':
        s1 += char
        
    if char == ']':
        if len (s1)>0:
            if s1 [len(s1)-1)]== '[':
            s1 = s1[:-1]
    if char == '(':
        s1 += char
        
        if char == ')':
            if len(s1)>0:
                if s1[len(s1)-1] == '[':
                s1 = s1[:-1]
    if char == '<':
        s1 += char
        
    if char == '>':
        if len (s1)>0:
            if s1[len(s1)-1] == '<':
                s1 = s1[:-1]
    print(s1)
